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Inflammation of the Testicle (Orchitis) (cont.)

Orchitis Causes

Patient Comments

Orchitis most commonly occurs as a result of a viral infection.

  • The virus that causes mumps is most commonly implicated as the cause of orchitis.
  • Approximately one third of boys will develop orchitis from mumps infection.
  • It is most common in young boys, and testicular inflammation typically develops 4-6 days after the onset of mumps.
  • There are case reports of mumps orchitis occurring after immunization with the mumps, measles, and rubella (MMR) vaccine, but this is rare.
  • Other less common viral organisms which can cause orchitis include varicella, coxsackievirus, echovirus, and cytomegalovirus (associated with infectious mononucleosis).

Less commonly, orchitis can be caused by a bacterial infection. Generally speaking, most cases of bacterial orchitis occur from the progression and spread of epididymitis (inflammation of the coiled tube on the back of the testicle), either from a sexually transmitted disease (STD) or from a prostate gland/urinary tract infection. This condition is termed epididymo-orchitis.

  • Bacteria that can cause orchitis from prostate gland/urinary tract infections include Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Staphylococcus and Streptococcus species.
  • Bacteria that cause sexually transmitted diseases, such as gonorrhea, chlamydia, and syphilis, can cause orchitis in sexually active men, typically between the ages of 19-35 years. People may be at risk if they have many sexual partners, are involved in high-risk sexual behaviors, if their sexual partner has had an STD, or if the person has a history of STDs.

Individuals may be at risk for non-sexually transmitted orchitis if they have not been immunized against mumps, if they get frequent urinary tract infections, if older than 45 years of age, or if they frequently have a catheter placed into their bladder.

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The eMedicineHealth doctors ask about Inflammation of the Testicle (Orchitis):

Inflammation of the Testicle (Orchitis) - Symptoms

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Inflammation of the Testicle (Orchitis) - Medical Treatment

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Inflammation of the Testicle (Orchitis) - Causes

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Read What Your Physician is Reading on Medscape

Orchitis »

Orchitis is an acute inflammatory reaction of the testis secondary to infection.

Read More on Medscape Reference »


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